Would sprayable insulation foam sprayed into a mold make good stefans? (I would probably 3D print a mold for uniform stefan formation.) (That is an example of what I'd be using.)
Well?
You could try it but I think the foam might be too brittle.
At my Home Depot they have 10 foot straightened sections of PEX tubing. In fact I used to use it for rebarreling and stuff like that until I decided to update to CPVC
Judging by the video I'd say that it performs quite well but we will see for sure when someone gets their hands on one. I am very interested in this blaster.